CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Available-for-sale securities, at amortized cost	$ 1,384,804	$ 1,368,736
Fair value of held-to-maturity securities	19,434	19,625
Other borrowings, including certain amounts at fair value	$ 11,228	$ 11,292
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, shares authorized (in shares)	25,000,000	25,000,000
Common Stock, shares issued (in shares)	14,864,917	14,785,007
Treasury stock, shares (in shares)	103,921	105,449